Saw-guard



(N0 Mariel.

MCDONALD.

SAW GUARD.

Patented Nov. 6, 1883.

UNITEB STATES PATENT OFFI AUGUSTIN T. MCDONALD, OF SHELTON, CONNECTICUT.

S'AW-GUARD.

SPECIFICATION forming part of Letters IPatent No. 287,949, dated November'fi, 1883.

k Application filed Amil as, 1853. 7 (no model.)

To all whom it may concern tary sawingmachine.

Be it known that I, AUcusrIN T. McDon- ALI), a-eitizen of the United States, residing at Shelton, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in. Saw-Shields for Circular Saws, of which the followingis a specification, reference being had therein to the accompanying drawings.

This invention consists in a shield or guard for rotary saws, which is capable of both vertical and transverse adjustment for the purposes hereinafter described, and is provided with a pivoted dog, by means of which the material being sawed is held in proper position, all as will behereinafter described and claimed.

In the drawings, Figure 1 represents in side elevation any-improvements as applied to a ro- Fig. 2 is a top plan view of Fig. 1 minus the saw and the support for the material to be sawed. Fig. 3 is a hori zontal section taken on the line 3 3 of Fig. 2. Fig. 4 is a vertical section taken on theline 4: 4 of Fig. 2.

The obj eet of the present invention is to so construct and arrange a shield or guard for circular saws, by means of which the workman will be fullyprotected from injury and prevented from coming in contact with saws where the appliance is used; in rendering the shield transversely adjustable, in order that when the saw is adjusted so as to out either narrow or wide strips the shield may always be placed directly above the saw; in providing the shield at one end with a pivoted dog, by means of which the material being treated is held down and prevented from flying up and injuring the workman; and in. rendering the shield vertically adjustable to adapt said dog for operation against stuff of different thicknesses.

A represents a block, which is suitably attached to the saw-gage. i

13 represents a transverse slot or opening formed in 'theblock A, and having vertical slots or grooves C at each end, within which slides a block, D, within which a spindle or rod, E, has bearing. This spindle o'r rod E passes through the block D, its two ends projecting therefrom, asshown.

F represents the shield or guard, which is pivotally mounted upon one end, a, of the spindle E, and hasacurved forwardlyextend: ing arm, I), which, when the shield is in position, will extend over and across the path of the saw and some distance beyond, thereby entirely covering the saw -teeth and effectually guarding against persons coming in contact ily raised when it is desired to place a board,

0, or other piece of material in position for treatment. On its release it will drop down and rest up on the material with sufficient pressure to keep it down.

When the saw (I is adjusted longitudinally upon its arbor to permit itto saw strips of different widths, the shield can be correspondingly adjusted, so as to keep it vertically above the saw, by simply loosening the clampingscrew H, which passes through the sleeve A and grips the rod E, and then sliding said rod E, with its thereto attached shield, inthe desired direction. When the desired position has been obtained, the screw H is tightened down uponthe rod E, and said rod isthen held firmly in position.

I represents aworm-screw,whose lower end engages with a screw-threaded'socket, e, in the sliding block D. When it is desired to operate upon stuff of more or less thickness, by turning this screw I in either the one direction or the other the block D, with the rod E and.

shield F and dog G, will be correspondingly raised, or lowered. By this means, whatever the thickness of the material being operated upon, the shield F can always be so adjusted as to be sufficiently close tothe saw to cover the same, and the dog G likewise sufficiently close to the board or material being sawed to rest thereon with the desired pressure.

The screw I is at its upper end provided with collars f, which have bearing against the upper and undersides, respectively, of a plate, 9, having slot h, and attached to the top of the block A. This screw has bearing at its lower end in the lowerpart of block A and at its upper end in the slotted bearing-plate g, and the threads thereon are of a reverse order to the threads in the block D. Therefore, as the screw is turned within its respective bearings, the block D will be'either raised or lowered, depending upon the direction in which the screw is turned. The impossibility of vertical movement of the screw insures the operation of said block at each movement of the screw.

Theblocl: D is, as shown in Fig. 3, formed integrally with the sleeve A, which latter is screw-threaded at a. e

B represent a washer, having a square center to adapt the same to fit the block D, and

represents a nut, which clamps the block and sleeve sufficiently to prevent the horizon tal movement thereof.

Having thus described my invention, what I claim therein isl. A saw-guard composed of a block adapted to slide in vertical ways, a spindle or rod l having bearing in and adapted to slide transversely within said vertically-slidin g block, a shield mounted upon oneend of said spindle,

and having a curved end adapted to extend over and across the path of the saw, and a pivoted dog adapted to hold down the material with the sliding block, a spindle-or rod having adjustable bearing transversely within said block, and a saw guard or shield mounted upon the outer end of said spindle to permit of the same moving in both avertical and a trans verse direction, substantially as set forth.

In testimony whereof I affix my signaturein presence of two witnesses.

AUGUSTIN T. MODQNALD. l/Vitnessesz i CHAnLns' STEWART, CHAS. A. OAKs. 

